Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Details 2)

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Intangible Assets (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Amortization expense for intangible assets        
Amortization expense $ 1,568 $ 1,624 $ 3,152 $ 2,603